US 12,442,389 B1
Mill spindle fan
Colton Gruber, Royal Oak, MI (US); and Donald C. Grzebienik, Oxford, MI (US)
Assigned to GM Global Technology Operations LLC, Detroit, MI (US)
Filed by GM GLOBAL TECHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed on Jun. 25, 2024, as Appl. No. 18/753,294.
Int. Cl. F04D 29/38 (2006.01); B23Q 3/12 (2006.01); F04D 29/34 (2006.01)
CPC F04D 29/388 (2013.01) [B23Q 3/12 (2013.01); F04D 29/34 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A mill fan, comprising:
a plurality of fan blades each having a radially inner end and a radially outer end, wherein the plurality of fan blades are configured to direct an airflow towards a distal end of a mill cutting tool;
an attachment sleeve having a radially inner surface and a radially outer surface, wherein the radially inner surface includes a mill cutting tool contact surface and the radially outer surface is in engagement with the radially inner ends of the plurality of fan blades; and
an outer sleeve connecting the radially outer ends of the plurality of fan blades, wherein the outer sleeve forms a ring, wherein the attachment sleeve is partially axially offset from the outer sleeve relative to an axis of rotation of the mill fan.